Abstract
This paper presents a hysteretic (sliding mode)
control IC for a buck DC/DC converter for use as an envelope
tracking power supply to increase the efficiency of an RF
power amplifier. The IC integrates a high-bandwidth error
amplifier, a comparator with hysteresis, and a high-side
driver for an external N-channel power MOSFET. The total
control loop delay using the implemented IC is 35ns, this is
shown to be a 30% reduction compared to a state-of-the-art
discrete IC based solution. The presented results also show
that it is viable to integrate a 100MHz operational amplifier
on the same die as a high-voltage MOSFET driver operating
with slew rates in excess of 5V/ns. The IC is demonstrated in
a tracking power supply with 30W output power and 3μs
rise/fall time, running from a 40V input. The complete IC,
including pads, takes up 4mm2 in a 0.35μm 50V CMOS
process.
| Original language | English |
|---|---|
| Title of host publication | ESSCIRC 2007 |
| Publication date | 2007 |
| Publication status | Published - 2007 |
| Event | ESSCIRC 2007 - Munich, Germany Duration: 1 Jan 2007 → … |
Conference
| Conference | ESSCIRC 2007 |
|---|---|
| City | Munich, Germany |
| Period | 01/01/2007 → … |
Cite this
Høyerby, M. C. W., Andersen, M. A. E., & Andreani, P. (2007). A 0.35μm 50V CMOS Sliding-Mode Control IC for Buck Converters. In ESSCIRC 2007